A skirt and top for Barbie.

Top is worked sideways, knitted flat, then sewn in center back and straps are attached in the back.
Skirt is worked flat, top down, then sewn in center back.

Look for pattern by number at http://www.stickatillbarbie.se.
The website is in English & Swedish, but patterns are available in several languages.

On the website you’ll find the patterns listed on the left, by number, grouped on pages.
Accessories like hats, scarves or bags are listed in the accessory section, below in the left column.
Click on numbers to open a page, look for the numbered image, then for the link to the desired language below it (clicking on the image will only enlarge it).

This pattern comes in a .doc file.

No specific yarn or gauge is given in the pattern.
Usually Sticka till Barbie patterns call for 4 ply mercerized cotton yarn or other fingering yarn, and gauge for stockinette stitch is given in the yarn page of the site.